(tan(∠ POQ)=((OverBar[PS])/(OverBar[OS]))≈((OverBar[PS])/(OverBar[OP]))≈((PQ×cos(∠ COP))/(OverBar[OP]))≈((PQ×cos(∠ COP))/(H/cos(∠ COP)))(17)               tan(∠ POQ)=(p/(FFL(ω)))(18))